The one we have know which is a Kohler was put in September of 2022. The on before that was put in February of 2021. Before that 2017.. Before 2017 it was 2002. I hear Delta is the best. Plumbers anymore do not want to fix them. They want you to buy them and they come out and install what you have bought. I am not a handyman and realize some people fix them themselves.